DE3109227A1 - CUTTING ON THE HEADBOX OF A PAPER MAKING MACHINE - Google Patents

Description

Cutting nozzle on the head box of a paper making machine

The invention relates to a cutting nozzle applied to a head box for a papermaking machine can be.

Figure 1 shows the example of a cutting nozzle of a conventional head box. The grommet 1 is by means of a ratchet rod ? with a slope of about 150 mm and a connecting metal 3 bent in the Z-direction so that the nozzle opening is changed. Thus, the flow velocity is also changed in the width direction perpendicular to the drawing surface and a fine adjustment of the weight profile is effected in the width direction.

In this case, the surface in contact with the liquid will be applied the cutting nozzle 1 pressure is applied to a jet J to obtained, whereby the cutting nozzle 1 is moved away from a cutting body 5. To prevent this shift, a spring 6 is provided. In addition, the fine adjustment of the grommet 1 in the width direction is reproducible low, in part because the sliding R <= ibkrnft des Cutting body 5 is increased due to the force of the spring 6, in part because between the cutting nozzle 1 and the connecting metal 3 there is a relative slippage and in part because the cutting nozzle has flexural rigidity in the width direction owns etc.

Since a corner on the connection part A is located between the cutter body 5 and the liquid-contacting surface of the nozzle 1 is located, a turbulent flow is also generated, which not only destroyed the beam J, foam is also accumulated on the A-part.

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In this FnIl occur on the surface of the beam J Turbulence, forming streaks and the like. On what may be a problem in terms of Quality of product leads. In Figure 1 (b), which shows part X in Figure 1 (a) in detail, an error in the flatness of the surface K at the tip of the cutting nozzle 1 causes an error when opening and causes the nonuniformity of the beam J. With 13 is a wire or the shaping of a wire and H denotes a shaping roller.

The invention is directed to solving these problems with conventional equipment and the provision of a cutting nozzle directed to a construction in which the main body and the connector on the side in contact with the liquid the grommet lie in the same plane, with a narrowed part of the grommet with low bending stiffness in orthogonal Direction of flow in the width direction between the PaCJteil the grommet is formed to the main body and the tip part of the grommet, the adjustment of the tip gap between the spout and the fitting grommet only by bending the grommet on the tip side with respect to the narrowed part and from this way is effected by means of several adjustment rods, and which are located in the width direction, and which the Liquid-contacting surface of the spout has been shaped into a smooth surface to match the flow line to the tip to constantly squeeze. After this construction, the rear can be prevented from soiling Reproducibility is improved and the beam influence can be kept very small.

Furthermore, the invention provides a cutting nozzle in which at the tip part of the fitting nozzle, the sum stretching and constricting the gap between it and the grommet is bent in order to

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by fine-tuning the weight distribution m of the general direction. Eb gives one there rectifying part with a slightly compressing slope that can run parallel to the fitting grommet. According to this construction, the jet can be uniform in the width direction and the flow can increase the beam surface can be kept very small.

Preferred embodiments of the invention are made described with the help of the drawings «In these is:

Figure 1 (a) is a side view of an example of FIG

Cutting spout at the top of a standard head box;

Figure 1 (b) is a detailed view of part X in Figure 1 (a) showing

Fig. 2 to 4 show side sections of the cutting nozzle

according to the embodiments of the invention,

Figure 5 (a) is a schematic representation of the state

of the jet through the usual cutting • nozzle, and

Figure 5 (b) shows schematic representations of the supply

state of the beam in still further embodiments of the invention.

In Figures 2 and 3, a cutting nozzle 7 is with a tip part 7a, a mating part 7b and a narrowed part 7c on the cutter body 8 through the fitting part 7b shown fastened by means of screws 9, its attachment

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end part is molded into a flat surface on the side in contact with the liquid (see the Character B in Figure 2 and the character C in Figure 3). Figure 2 shows an embodiment in which the adjustment lifting rod 10 is attached directly to the tip part 7a, while FIG. 3 shows another exemplary embodiment shows, in which the adjustment lever 10 is connected to the cutting nozzle 7 via a connecting metal 11 which is divided in the width direction. That is to say, in the exemplary embodiment according to FIG. 3, the Kfbestange int 10 screwed to the cutting nozzle 7 and at the same time a screw 12 is unscrewed from a hole 11 π, that is located on a side surface of the joining metal 11 is so that the tip portion 11b the connecting metal 11 and the screw 12 clamp the cutting nozzle 7 between these and the nozzle 7 with the Connect lifting rod 10.

On the fitting part 7b of the cutting nozzle 7, fitting part 7b, the cutting body 8 is narrowed by means of screws 9 and the Part 7c attached between the adapter part 7b and the tip part 7a of the cutting nozzle, whereby dor veron / rete Part has a low bending stiffness in the orthogonal direction to the flow. Furthermore, the Liquid contacting surface of the cutting nozzle 7 has a smooth shape D so that the flow line to the tip part 7a is constantly compressed. With J is a beam, with 15 a spout, with 16 a wire or a wire forming and 17 denotes a forming roller. The construction of the connecting metal 11 in FIG. 3 does not constitute a limitation of the invention.

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In the second exemplary embodiment of the invention in FIG. 4, the cutting nozzle 107 is shown and fastened to the cutting body 108 by screws 109 no connection part B on the "contacting" part Page is made flat. The adjustment lifting bar 110 is attached directly to the cutting nozzle 107.

The cutting nozzle 107 thus has a narrowed one Part 107c of low rigidity between the fitting part 107 "b, on which the cutting nozzle on the cutter body 108 is fixed with screws 109, and the tip portion 107a of the cutting nozzle. When the lift bar is 110 in Z direction is moved, the tip portion 107a becomes the Spout 107 bent so that the gap between itself and the lower spout 112 is stretched, whereby the spout opening changed and thus the flow velocity is changed in the width direction, so that a fine adjustment of the weight profile takes place in the width direction.

The cutting nozzle 107 is also provided on your 107a with a rectifier part H, dos one has a somewhat compressive slope which may extend parallel to the lower spout 112, en nbpr not have to. Even if the rigidity at the tip part H is increased by attaching the rectifier part H. As shown in Fig. 4, the adjustment of the opening in the width direction is because of the narrowed portion 107c not handicapped everywhere.

With 113 is a wire or a wire forming and with 114 denotes a forming roller.

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As already "described in detail," in the invention, the connecting part of the main body and the Liquid-contacting side of the spout flat »Furthermore, the narrowed part lies in with little rigidity orthogonal flow direction in the width direction between the mating portion of the grommet to the main grommet body and the Tip part of the grommet and several adjustment rods that come with dom tip part of the spout are connected so that the tip gap between the spout tip and the fitting grommet can be adjusted in the width direction. According to this arrangement, the setting of the Grommet in the width direction over the adjustment of the adjustment rod in the Z direction, which the narrowed part in Cut direction as well as the tip part on the front side of the narrowed part bends in the width direction. Since this construction does not contain the sliding surface of the usual device, the reproducibility of the Adjustment in the width direction can be improved.

Since the liquid contacting surface of the spout has been brought into the smooth shape so that the flow line is compressed to its tip, the Flow is not disturbed and no foam is deposited. D.-besides, there is an inconsistent flow only with Difficulty and the beam is severely affected. If by chance the grommet and the adjusting rod by immediate Screwing the rod to the grommet or coupled via the connecting metal is the distance of movement in the Z-direction so that it is transferred to the grommet.

In the case of the invention, the rectifier part has a slight compressive incline, which leads to the meta11-

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spout can extend at the tip part of the spout, which is bent in a direction that the gap between it and the adapter sleeve is larger or smaller, and the fine weight distribution setting in To carry out the width direction. When the jet J is sprayed from the tip of the cutting nozzle, the Jet flow between the fitting grommet and the gloicbreaker part with low compression angle binduroh-

parallelzL
which can run to the adapter grommet, via not rough3, which directs the streamline. The beam can thus be stabilized and radiate smoothly.

FIG. 5 (a) shows an embodiment in which the usual cutting nozzle 1 is provided, while FIG Fig. 5 (b) shows the embodiment in which the cutting nozzle 207 according to the invention is used * The difference the effect between these is explained with reference to the drawings. In Figure 5 (a) the flow hits in the X direction against the flow in the Y direction, no d ^ ß Turbulence occurs in the flow, and as a result of this, the jet surface is quickly destroyed. In Figure 5 (b) the flows in both the X ~ n.ls and the Y-direction are corresponding to the cutting nozzle (217) rectified by the rectifier part H and have a slight inclination that is parallel to the adapter grommet can run, but does not have to. The turbulence is weakened so that the jet is not and will not be destroyed The flying distance is increased, as shown in the drawing. With 212 there is a lower grommet, with 213 a wire or a wire forming and with 214 denotes a forming roller.

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Another embodiment of the invention is shown in Figure 5 (c). The cutting nozzle 307 is in C-direction as well as in D-direction ". By this arrangement the angle of impact between the beam J and the wire 313 of the forming roller 314 is reduced and the Disturbance of the beam can be kept very small when the beam J hits the wire 313 and so a collapse the formation prevented. The lower spout is marked with 312,

As described, can according to the invention aas rays are stabilized, the turbulence on the straw surface can be kept very small and also dsβ Appearance of streaks. Compared with the usual cutting nozzle, the beam can be uniform in the width direction outflow when the part of the relatively large area of the rectifier part in the width direction is uniform. In contrast to the usual cutting nozzle, the nozzle according to the invention keeps the non-uniformity of the jet very small, -njch if there is an error in the flatness of the K-surface on the Tip of the cutting nozzle. This makes production easier.

According to the invention, the cutting nozzle part can also be used in the C-direction of Figure 5 (c) can be removed when the jet turbulence is smaller and its flying distance is great. It is therefore possible to increase the thickness of the lower grommet and the machining stress to reduce. This stress occurs through heat and fluid pressure, etc.

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Claims (3)

Claims 1.) Cutting nozzle for obtaining a sheet-like jet, characterized in that a main body (8) and the connecting part (7b) * nf of the surface of the Ti] IIe in contact with the liquid are mounted on the same plane that a front part (7c ) with low flexural rigidity in the orthogonal direction of the flow between the Paßtoil (7b) of the grommet (7) to the main body (8) and the tip part (7a) of the grommet in the width direction, and that several with the tip part (7a) of the grommet connected adjusting rods (10) are arranged to adjust the gap between the grommet (7) and its main body (8) in the width direction. 130063/0713 TELEX. TELEGRAM: PHONE: BANK ACCOUNT: CHECK ACCOUNT 1-856 * 4 INVENTION BERUN BERUNERBANKAa P MEtSSNEa BLN-W kl vend BERUN 030 / 8B1 6037 BERUN 31 404737-103 030 / Μ1302β 3,571βΟΟΟ 2. Spout according to claim 1, characterized in that that the liquid-contacting surface of the spout has been brought into a mouth shape, that the flow line to the tip is constantly compressed will. 3. Spout according to claim 1, characterized in that it is bent in one direction that it makes the gap between itself and a fitting grommet larger and smaller and the weight distribution is adjusted in the width direction, and that a rectifier part (4) with low compression pressure which can extend parallel to your fitting grommet, but does not have to be at the tip of the grommet (7) is located. - 3 - 130083/07 13